Add config option to disable 404 page

[connor-baer]

Description

• Closes Subpath: This route collides with: "src/pages/404.astro". #1080
• Add a new user config option disable404Route to disable injecting Starlight's 404 page
• Update the configuration reference with the new option
• Update the “Custom 404 page” section in the docs

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Name	Status	Preview	Updated (UTC)
starlight	✅ Ready (Inspect)	Visit Preview	Jan 26, 2024 10:15pm

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🦋 Changeset detected

Latest commit: 09302e9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@astrojs/starlight	Minor

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[delucis]

Awesome work @connor-baer! This looks great to me even without the extra todo item — we can always tackle that later. Left one small suggestion on the docs, but the code seems spot on 🙌

[delucis]

Thanks again for your contribution @connor-baer! Hope you don’t mind I jumped in to polish up the last docs changes so we can get this released today.

Appreciate you helping out 🌟

[connor-baer]

@delucis, I don't mind at all, thanks for finishing this up! 🙌🏻